Automatically sealable paste tube of



Feb. 7, 1956 v. 'r. CIHRSTROM AUTOMATICALLY SEALABLE PASTE TUBE OF PLASTIC 0R SIMILAR MATERIAL Filed Nov. 18. 1952 FIG.2

\NVENTO@ United States Patent Oflice 2,733,837 Patented Feb. 7, 1956 AUTOMATICALLY SEALABLE PASTE TUBE OF PLASTIC OR SIMILAR MATERIAL Vilhelm T. fihrstriim, Stockholm, Sweden, assignor to A. B. Svenska Kapsylfabriken, Stockholm, Sweden Application November 18, 1952, Serial No. 321,090

Claims priority, application Sweden August 21, 1952 2 Claims. (Cl. 222-107) The present invention relates to an automatically sealable tube for pastes of low or high viscosity or the like. It is of the type consisting of a case of plastic material, cellophane, paper or the like, closed at one end, and is substantially characterized in that the other end of the tube is shaped so as to form a neck of smaller diameter than the case, said neck-shaped portion being hermetically closed for the outer air and being surrounded by a spring arranged in such a manner that, when the neck-shaped portion is cut off above the spring said spring due to pressure on the tube is resiliently forced outwards by the contents of the tube so that a suitable quantity of the contents is let through, whereafter the spring when the pressure on the tube ceases, automatically presses the neck shaped portion together and thus seals the tube.

An embodiment of the invention is shown in the accompanying drawing.

Fig. 1 shows a frontal view of a hermetically sealed tube, Fig. 2 shows a side view of said tube and Fig. 3 shows a detail of said tube.

In the drawing 1 designates the tube case, preferably made of a hose of plastic material, cellophane, paper or similar material. One end of the case is open but after the contents have been fed in, said end is sealed preferably by welding along the edge 2. The other end of the tube is drawn together in such a manner that a neck-shaped portion is formed, the edges of which (3 and 4) are welded together so that the tube is hermetically sealed for the outer air. The edges 4 of the neck are spread apart from each other, so that the neck has a greater width at the upper end thereof, and a spring 5 which surrounds the neck, is provided where the edges 4 merge into the edges 3. The spring is preferably a leaf spring one end of which is doubled back over the other end. The branches of the spring are pressed together so as to rest resiliently against each other. The spring need not be glued to the neck.

Before the tube is used the neck is cut oif along the line of short dashes 6 and at pressure on the tube the contents press the branches of the spring apart so that a suitable quantity is let through, whereafter the spring automatically presses the neck together and seals the tube, when the pressure ceases.

Compared with expensive metal tubes the tube according to the invention is extremely cheap to manufacture. The tube according to the invention completely supersedes said metal tubes besides which the disadvantages associated with the screw devices hitherto used, are eliminated. The tube may be used for foodstuif of semi-fluid consistency, such as caviare, mayonnaise, sauce and the like, but also for all kinds of toilet pastes, shoe-polish, soap and the like. The tube can without difiiculty be provided with advertisement text in usual manner.

Having now described my invention, what I claim as new and desire to secure by Letters Patents is:

1. Automatically scalable tube for holding and dispensing pastes formed of plastic material and closed at one end, in which the other end of the tube is shaped so as to form a shoulder and a flattened neck portion of a smaller size than the body of the tube and is hermetically suitable quantity of the contents, whereafter, when said pressure ceases, said spring automatically compresses the mouth of the neck portion and closes the tube.

2. A tube according to claim 1, in which one end of the spring is doubled back over the other free end of the spring, so as to form a locking hook, whereby the spring is restrained from slipping off the neck laterally.

References Cited in the file of this patent UNITED STATES PATENTS 1,840,194 Hahn et a1 Jan. 5, 1932.

1,945,612 Lacher Feb. 6, 1934 2,103,389 Salfisberg Dec. 28, 1937 FOREIGN PATENTS 381,875 Great Britain Oct. 13, 1932. 

1. AUTOMATICALY SEALABLE TUBE FOR HOLDING AND DISPENSING PASTES FORMED OF PLASTIC MATERIAL AND CLOSED AT ONE END, IN WHICH THE OTHER END OF THE TUBE IS SHAPED SO AS TO FORM A SHOULDER AND A FLATTENED NECK PORTION OF A SMALLER SIZE THAN THE BODY OF THE TUBE AND IS HERMETICALLY CLOSED TO THE OUTER AIR, SAID NECK PORTION HAVING THE UPPER END THEREOF WIDER THAN THE PORTION NEAR THE BODY, A SPRING SMUGLY SURROUNDING SAID NECK PORTION AT A POSITION NEXT TO THE OTHER SHOULDER OF THE BODY AND RESTING ON SAID SHOULDER, SAID SPRING BEING HELD IN POSITION BY ITS OWN RESILIENCY AND BY THE WIDER UPPER END OF THE NECK PORTION, AND BEING ARRANGED IN SUCH A MANNER THAT, SAID SPRING, UPON PRESSURE ON THE BODY OF THE TUBE IS FORCED RESILIENTLY OUTWARDS BY THE CONTENTS OF THE TUBE AND LETS THROUGH A SUITABLE QUANTITY OF THE CONTENTS WHEREAFTER, WHEN SAID PRESSURE CEASES, SAID SPRING AUTOMATICALLY COMPRESSES THE MOUTH OF THE NECK PORTION AND CLOSES THE TUBE. 